ISL78100
Typical Performance Curves (Continued)
41
42
5 LEDs
40 I LEDpeak = 380mA
DUTY CYCLE = 10%
3 LEDs
41 I LEDpeak = 380mA
40 DUTY CYCLE = 10%
PWM @ 100Hz
39
38
37
36
35
10% @ 100Hz
10% @ 10kHz
39
38
37
36
35
34
33
PWM @ 10kHz
34
6
8
10
12
14
16
18
32
4
5
6
7
8
9
10
V IN (V)
FIGURE 13. 5 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 10%
V IN (V)
FIGURE 14. 3 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 10%
400
RSET = 0.5 Ω
0.1000
EN/PWM = 0
350 DUTY CYCLE = 100%
300
V LEVEL = 1V
T A = +25°C
250
200
5 LED
8 LED
0.0100
150
0.0010
100
50
3 LED
0
0
0.2
0.4 0.6
0.8
1.0
0.0001
6
8
10
12
14
16
18
V LEVEL (V)
FIGURE 15. LED CURRENT vs V LEVEL BIAS
V IN (V)
FIGURE 16. QUIESCENT CURRENT (NON-SWITCHING)
8 LEDs
I LED = 350mA
VIN
8 LEDs
I LED = 350mA
VIN
FIGURE 17. START-UP WAVEFORMS
6
LX
IL
FB
LX
IL
FB
FIGURE 18. START-UP WAVEFORMS ZOOM-IN
FN6626.1
December 24, 2013
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